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Load adjustment method and system for high pressure polyethylene plant

A high-pressure polyethylene and load adjustment technology, which is applied in the field of polyolefin production, can solve the problems of narrow load adjustment range, upstream and downstream material imbalance, and cost increase, and achieve the effects of improving production efficiency, avoiding material imbalance, and enhancing load adjustment capabilities

Active Publication Date: 2021-12-17
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a load adjustment method for a high-pressure polyethylene plant in order to overcome the technical problems existing in the prior art that the upstream and downstream material imbalance, production inefficiency and cost increase are likely to occur due to the narrow load adjustment range of the polyethylene plant and system

Method used

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  • Load adjustment method and system for high pressure polyethylene plant
  • Load adjustment method and system for high pressure polyethylene plant
  • Load adjustment method and system for high pressure polyethylene plant

Examples

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Embodiment approach

[0067] According to a specific embodiment of the present invention, the load processing unit 3 includes:

[0068] The reaction pressure adjustment unit 30 is used to adjust the inlet pressure of the compressor to 26-30MPa to increase the polymerization load when the inlet temperature of the compressor is kept constant;

[0069] And / or, the initial temperature adjustment unit 31 is used to adjust the temperature of the reaction material after preheating to 160-165° C. to increase the load of the polymerization reaction;

[0070] And / or, the peak temperature adjustment unit 32 is used to adjust the reaction peak temperature 304-308°C inside the reactor to increase the polymerization reaction load;

[0071] And / or, the heat exchange medium adjustment unit 33 is used to control the temperature difference of the heat exchange medium at the inlet and outlet of the reactor to 10-15° C. to increase the load of the polymerization reaction.

[0072] According to another specific embodi...

Embodiment 1

[0083] The difference from Comparative Example 1 is that the inlet temperature of the compressor is kept constant, and the inlet pressure of the compressor is adjusted to 26-30MPa, preferably 28MPa, so that compared with the original design condition, the inlet pressure of the compressor is increased by 3MPa, and the delivery The amount of ethylene gas in the reactor increases by 1 ton / hour, so the density of ethylene delivered to the polyethylene reactor increases, the conversion rate of ethylene increases, and the final polyethylene output reaches 40.8 tons / hour. The polymerization reaction of the high-pressure polyethylene device The load is increased to 100.7% of the original design load.

Embodiment 2

[0085] The difference from Comparative Example 1 is that the peak reaction temperature inside the reactor is adjusted to be 304-308°C, preferably 307°C. Since the heat released when the polymerization reaction reaches equilibrium increases, the conversion rate of ethylene increases, and the final output of polyethylene reaches 41.7 tons per hour, the polymerization load of the high-pressure polyethylene unit increased to 103% of the original design load.

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Abstract

The invention relates to the field of polyolefin production, and discloses a load adjustment method and system for a high-pressure polyethylene device, wherein the load adjustment method includes: judging whether the storage capacity of reaction materials meets the tank storage requirements, and if so, not adjusting the load of the high-pressure polyethylene device If the storage capacity of the reaction material does not meet the tank storage standard, the high-pressure polyethylene device will be operated to increase or decrease the load, including adjusting the reaction pressure, reaction initial temperature, reaction peak temperature, heat exchange medium At least one reaction condition among temperature difference and initiator addition amount is used to increase or decrease polymerization reaction load. By applying the method provided by the invention, by controlling one or more reaction conditions in the polymerization reaction process, the adjustment range of the polymerization reaction load is expanded, and the load adjustment ability of the polyethylene device is enhanced.

Description

technical field [0001] The invention relates to the field of polyolefin production, in particular to a load adjustment method and system for a high-pressure polyethylene device. Background technique [0002] Ethylene is polymerized according to the free radical reaction mechanism under high temperature and high pressure conditions, and a macromolecular chain transfer reaction occurs to generate linear macromolecules with more long-chain and short-chain branches, resulting in low crystallinity and low density of the polymerization product. Therefore, high-pressure polyethylene is also called low-density polyethylene. [0003] High-pressure low-density polyethylene products are widely used in agricultural film (shelf film, mulch film), heavy packaging film, shrink film, transparent film, insulating material and The production of cable sheaths is also used in processing fields such as injection molding, extrusion, and foaming. In the process of polyethylene production, the et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F2/00
CPCC08F110/02C08F2/00
Inventor 黄起中孙爱光徐海波马雷姜兴剑孙浩
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD